Abstract
The objective of this paper is to investigate the performance of 8/6 switched reluctance motor (SRM) when excited with sinusoidal voltage. The conventional R dump converter provides DC excitation with the help of capacitor. In this paper the converter used is the modified R dump converter without DC link capacitor providing AC or sinusoidal excitation. Torque ripple and speed ripple are investigated based on hysteresis current control. Constant and sinusoidal current references are considered for comparison in both DC and AC excitation. Extensive theoretical and experimental investigations are made to bring out the merits and demerits of AC versus DC excitation. It is shown that the constructionally simple SRM can be favorably controlled with simple R dump converter with direct AC excitation without need for DC link capacitor. A 4-phase 8/6 0.5 kW SRM is used for experimentation.
Highlights
The switched reluctance motor (SRM) is the simplest and most efficient variable speed drive
SRM drives are excited with DC supply
The cost and performance of SRM drives are dependent on converter topologies and motor structure
Summary
The switched reluctance motor (SRM) is the simplest and most efficient variable speed drive. The SRM is capable of providing unidirectional torque for bidirectional current; it can be excited with matrix converters [11,12,13,14]. The objective of this paper is to provide simple converter and control strategies for SRM to be operated with direct AC excitation with minimum number of switching devices and storage elements. The configuration used in this paper for excitation is a full bridge diode rectifier followed by modified R dump converter without any capacitor at both the DC link and R dump circuit.
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